Powertrain, generic · Transmission

P0705 Transmission Range Sensor A Circuit (PRNDL Input)

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The transmission range sensor (selector or multifunction switch, PRNDL) reports the selected range; it may be a multi-contact switch with a bit pattern per position, an analog sensor with two opposing voltages adding up to 5 V, or a contactless PWM sensor. Its second channel has its own codes (P2801–P2805). P0705 is the circuit or pattern fault: the module receives a combination that matches no valid position. Ford flags an invalid pattern after 5 s (digital sensor) or 200 ms (4-bit sensor), checking continuously with the check engine light; Saab's 9-5 (9600) detects an impossible combination of its four contacts and goes into limp mode with the gearbox warning. The transmission no longer knows the range reliably – limp mode, start interlock or reversing light may be affected. Check the harness for shorts to ground before replacing the sensor.

Likely causes

Range sensor worn, dirty or with oil or water ingress
Sensor misadjusted or selector cable out of adjustment
Harness or connector at the transmission damaged, short to ground
Transmission or engine module input faulty

Symptoms

  • Check engine and/or transmission warning lamp
  • Transmission limp mode, fixed gear, harsh shifts
  • Starting problems in P/N or start interlock
  • Wrong gear indication, reversing light not working

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–450
Time0.5–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Check sensor adjustment
  2. Check signals in each position
  3. Inspect wiring

Parts involved

transmission range sensorsensor wiringtransmission control module

Related codes

P0706P0707P0708P0709P0850P2805

References: law.cornell.edu, newtonnet.co.uk, fordservicecontent.com, saabwisonline.com.